Steam-boiler



(No Model.)

T. MURPHY. STEAM BOILER.

No. 520,936. Patented June 5, 1894- FWJ,

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UNITED STATES;

PATENT ()FFICE.

THOMAS MURPHY, OF DETROIT, MICHIGAN.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 520,936, dated June 5, 1894.

Application filed February 27, 1893. $erial No. 463,901. (No model.) I

To all whom it may concern: Be it known thatI, THOMAS MURPHY, a citizen of the United States, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Steam-Boiler Furnaces, of which the following is a specification, refer once-being had therein to the accompanying drawings.

This invention relates more particularly to improvements in the construction of furnaces the stack'of tubes all as more fully hereinafter described.

In the drawings, Figure 1 represents a ver tical, longitudinal section of a wellknown form of sectional boiler to which my invention is applied, and Fig. 2 is a plan of the same with the upper section of the boiler re moved. Fig. 3 is a detail plan of one of the blocks.

The boiler represented in the drawings is of that type known as the water-tube safety boiler in which A represents the horizontal steam and Water-drum; B the mud drum and O a connected stack of water tubes downwardly inclined from front to rear and communicating with the drums A and B.

D is thefurnace proper.

E is the furnace chamber in which the boiler is inclosed, and F F are intermediate partitions or so-called baffle or division plates placed at suitable distances across the stack of tubes whereby the space between the tubes is closed to compel the gases of combustion to pursue an up and down course through the stack of tubes on their way to the chimney as indicated by the arrows in dotted lines. Furnaces of this description are in extensive use, but from a close observation of them I have discovered that, although the whole stack of tubes are accessibly located to the hot products of combustion, only a portion of the stack really represents an efiective heating surface. This is especially the case with the front end of the stack; Here the products of combustion from the furnace taking naturally the most direct course toward the smoke-stack as indicated by the dotted arrow leave the front ends of the tubes forming the stack almost untouched, thus in reality a considerable portion of the front end of the stack does not form an efiective heating surface and the efficiency of the boiler is thereby considerably less than it would be if this portion of the stack could be made to do its duty. My invention is primarily designed to accomplish this object by a lateral extension H of the transverse baffle plate F toward the front of the stack along the top thereof. This extension I preferably make of reticulated brick or tile work supported directly by the top row of tubes and provided with apertures J through which the products of combustion may pass on their way to the smoke stack.

I preferably use the special form of tile K, which is substantially of rectangular shape with a projection b on one edge, these tiles are placed in transverse rows with open intervals as shown whereby the tiles interlock and are thereby held firmly in place. In this way no fastenin gs orextra supports are needed to hold the tiles in place and they can be readily removed and replaced. The weight of the tiles is but inconsiderable and being loosely jointed they can freely expand and contract without damage to themselves or to the supporting tubes. It is not necessary to extend the tiles over the whole front section of the stack, it is even preferable to leave an open throat K, so as to make a freer exit at this point. 'The function of this perforated baffle plate H is to dam up the products of combustion in the front section and thereby distribute the volume thereof, so as 'to entirely envelop the whole front section of the boiler and make every inch of tubing therein an eifective heating surface The baffle plate H the bridge wall, it will be seen that the loss tion similar to the front section 5 as-also shown by a dotted line.

The advantage of placing the baffle at the top of the forward section of the tubes is that theheatedgases from the furnace are conducteddirectly and uninterruptedly into the tubes and there held or retained for a short period'thus imparting its heat to the tubes and! water. This effect could not be had'were the baflie at the base of the tubes.

I am aware that perforated baflie plates have been used"at the base of the stack, in connection with an imperforated' plate on the top of the stack; also that an imperforated baflie plate has been placed; on top of the stack with the portion below unobstructed. In each of these cases a dead air space is formed which materially interferes with the proper and rapid heating of the stack.

What I claim as my invention is In a steam boiler furnace, the combination with the furnace chamber E, of an inclined stack of water tubes above the same, a transverse vertical baftie plate extending from the bridge wall to the top of the stack, an unobstructed passage fromthe chamber to the top of" the stackand extending from the bafile plate to the forward ends of the tubes, and a single apertured baffle plate for the space between the verticalbaffleandthe forwardends of itheytubes'secured across the, upper'coursc of "tubes'in' front of' the-vertical baflie'plate,

substantially its-described.

In testilnonywhereof Tafflxm y signature in presence oftwo Witnesses;

THOMAS MURPHY; Witnesses:

J AMES WHITTEMORE, N. I LINDOP: 

